Answer:
1) 3.0 moles.
2) 2.0 moles.
3) 2.0 moles of H atoms.
4) 4. 6.02 x 10²³.
Explanation:
<u><em>Q1: How many moles of chlorine are present in 3 moles of MgCI₂?</em></u>
- MgCl₂ is dissociated according to the equation:
<em>MgCl₂ → Mg + Cl₂.</em>
<em>Every 1.0 mole of Mg is dissociated to 1.0 mol of Mg and 1.0 mol of Cl₂.</em>
∵ 1.0 mol of MgCl₂ gives 1.0 mol of Cl₂.
∴ 3.0 mol of MgCl₂ gives 3.0 mol of Cl₂.
<em><u>Q2: How many moles of H₂0 are needed to produce 1 mole of O₂ in the following equation? 2H₂O → 2H₂ + O₂.</u></em>
- From the balnced equation:
<em>2H₂O → 2H₂ + O₂.</em>
2.0 moles of H₂O produce 2.0 moles of H₂ and 1.0 mole of O₂.
∴ We need 2.0 moles of H₂O to produce 1.0 mole of O₂.
<em><u>Q3: How many moles of hydrogen atoms are present in 1 mole of H2 gas?</u></em>
- H₂ is dissociated according to:
<em>H₂ → 2H.</em>
1.0 mol of H₂ is dissociated to produce 2 atoms of H.
∴ 1.0 mol of H₂ contains 2.0 moles of H atoms.
<u><em>Q4: How many atoms or molecules are in a mole?</em></u>
<u><em /></u>
- It is known that every mole of any compound contains Avogadro's number of atoms or molecules (6.022 x 10²³).
So, the answer is: 4. 6.02 x 10²³.
D. Rutherford's gold foil experiment
An object will not move if:
A.) All forces acting on it are balanced.
This can be proved by example, while similtaneously proving the other answers wrong.
Take for example;
Two people are pushing on a box with 30N, one person being on the right, the other being on the left.
The opposing forces are exerting against eachother, creating a stable position on the box.
How about "if there was no gravity on it"?
Take for example an airplane. Turbulence effects the plane even when it's defying gravity.
The next two are easy to debunk.
"It's mass increases"
This can be disproved by anything.
If I were to become bigger, I'm not moving, my body is just extending in size.
This also applies to weight.
The answer is A.)
I hope this helps!